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Shift vs 0 index
(version: 0)
Comparing performance of:
Simple array vs Shift vs Index
Created:
2 years ago
by:
Guest
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Tests:
Simple array
arr = [1,2,3,4]
Shift
arr.shift()
Index
arr[0]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Simple array
Shift
Index
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0
Browser/OS:
Firefox 121 on Windows
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<iframe src="https://measurethat.net/Embed?id=498772" width="100%" height="500px"></iframe>
Test name
Executions per second
Simple array
65227520.0 Ops/sec
Shift
161974256.0 Ops/sec
Index
848103424.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the JavaScript microbenchmark you've provided. **Overview of the Benchmark** The benchmark measures the performance difference between accessing an element at a specific index (`arr[0]`) versus shifting elements from the end of an array (`arr.shift()`). The benchmark uses a simple JavaScript array with four elements and runs multiple iterations for each test case. **Options Compared** There are two main options being compared: 1. **Accessing an element at a specific index**: `arr[0]` 2. **Shifting elements from the end of an array**: `arr.shift()` **Pros and Cons of Each Approach** 1. **Accessing an element at a specific index (`arr[0]`)** * Pros: + Generally faster since it's a direct access operation. + Less memory allocation or deallocation overhead compared to shifting elements. * Cons: + May require more complex indexing logic, especially for large arrays. 2. **Shifting elements from the end of an array (`arr.shift()`)** * Pros: + Can be simpler to implement, especially when working with small arrays. * Cons: + Slower since it involves multiple steps: accessing the element, removing it from the array, and updating indices. + May involve more memory allocation or deallocation overhead. **Library Usage** There is no explicit library mentioned in the benchmark definition. However, some JavaScript engines (like V8) use various libraries under the hood to optimize performance. In this case, we can assume that the benchmark is using the built-in JavaScript engine with minimal optimizations. **Special JS Features or Syntax** The benchmark does not explicitly test any special JavaScript features or syntax. It focuses on two fundamental operations: accessing an element at a specific index and shifting elements from the end of an array. **Other Alternatives** If you wanted to modify this benchmark to explore other approaches, here are some alternatives: * Accessing elements in reverse order using `arr[arr.length - 1]` * Using `slice()` or `splice()` to manipulate arrays * Comparing performance with different data types (e.g., objects vs. arrays) * Incorporating additional overhead by adding synchronization primitives (e.g., locks) to the benchmark Keep in mind that modifying the benchmark will likely alter its behavior and accuracy, so it's essential to carefully consider any changes before sharing or comparing results.
Related benchmarks:
Splice vs shift to remove at beginning of array (fixed from slice)
Slice vs Splice vs Shift for 1 item
Splice vs Shift to remove from the beginning
[0] vs .shift() with empty array
Empty array: Splice vs Shift
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